Improvement in saws



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CHARLES DISSTO, OF PHILADELPHIA, PENNSYLVANIA l Letters Patent No.64,953, dated May 21, 1867.

IMPROVEMENT IN SAWS.

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TO ALL WHOM MAY-GONCERN:

Be it known that I, CHARLES DISSTON, of Philadelphia, Pennsylvania, haveinvented an improved Fastenl ing for Detachable Saw-Teeth; and I dohereby declare the following to he a fuli, clear, and exact descriptionof the same, reference being had to the accompanying drawing', and tothe letters of reference marked thereon.

My invention consists Aof an elastic detachable forked key, constructedand adapted for the retention of a detachable saw tooth, substantiallyas described hereafter.

In order to enablev others skilled in the art to make my invention, Iwill now proceed to describethe manner of carrying it into e'eet,reference being had to the accompanying drawing, which forms apn-rt ofthis specification, and in which- Figures I and 2 represent part of asaw-blade with the detachable tooth.

Figure 3, a sectional View of part of the blade". I i

Figure 4, a View of the tooth detached from the blade.

Figure 5, a section on the lined-2, iig. 1;- andv i Figure 6, aperspective Yview of the key by means Aof which the tooth is held inplacer A represents a parthof a saw-blade, a recess, X, representing thesegment of acircle, in thepedge of 'which is adapted for the receptionof the circular portionaof the tooth B, and from the rear of the Cuttingportion I of the latter extends aprojectio'n, c,` bea.rng on the edge ofthe blade. In the edge of the recess X are grooves e for the receptionofVor U-shaped ribs z' on the edge of the circular portion a' of thetooth', and in the edge are recesses u, through which recesses the ribsz" pass when the projection a' is introduced laterally into the recessX, thetoothbeing turned when its surface coincides with that of theblade, so as to bring the projection c against the edge of thesaw-blade, and to introduce the ribs z' into 'the grooves e, iig, 2. Inthe edge of the projection ais a recess, whi'cluwhen the tooth is in theposition shown in iig. 2, coincides with a similar recess in thesaw-blade, an opening, x, iig. 2, being thus formed for Vthe receptionofa detachab.e key, C, which lconsists of an elasticfork of the formshown' in iig. `6, the legs of the key springing apart and bearingagainst the tooth and the saw-blade, andy-shaped lips t t on the toothand on/tlle saw-blade projecting into similarly- Shaped recesses in theouter edges ofthe key, near the end of the same.4 Openings o o, iigs. 1and 2, are made in the edges of the tooth and saw-blade for thereception of the pointed jaws of'a pair of pliers, or other instrumentby means of whichv the vlegs of the forked key may be compressed inintroducing it 4in and withdrawing it from the opening. i I

By the use ofthese detachable keys the teeth may be secured to ordetached from-the saw-blade without 'that delay and liability ofinjuring the blade or tooth which results from the use of rivets andsimilar permanent fastenings. It will be apparent that the key may beused with detachable teeth of almost every description.

I claim as my invention, and desire to secure by Letters Patent- Anelastic detachable forked key C, constructed and adapted to theretention of a detachable saw-tooth, lsubstantially as specified.

.In testimony wvhereofI have signed my name to this specification in thepresence of two subscribing witnesses.

. CHARLES DIssToN. Witnesses:

CHARLES E. FOSTER,

W. J. DELANY.

